Dissipative Effects of an Isolated Bubble in Water on the Sound Wave

The dissipative mechanisms of an isolated bubble in water for sound wave are analysed on the basis of the linearized theory of oseillations of a gas bubble.It isshown that the dissipative effects are obvious and contain the scattering and absorptionof sound by a bubble the heat conduction is decisive in the dissipative effects of bu-bble;and the dissipative effects are maximum at resonance.

“唧唧复唧唧”之辨析

关于《木兰诗》中"唧唧复唧唧"历来有三种解释,即机杼声、叹息声和虫鸣声。但大量例证证明,将"唧唧"解为机杼声太僵硬,缺乏美感;解为叹息声太直白,不合情境;解为虫鸣声则最为恰当,既生动贴切,又具有起兴、烘托的艺术效果。